Load Specifications
Load data in caliber .458 Win.Mag. with .458 | 250gr | Hornady Monoflex bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Shooters World Buffalo Rifle, Lovex D060 and ReloadSwiss RS 36.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680ᴾ | <<locked>> | 100% | 55,448 psi | 89% | 2818 fps | 98.4% |
| Accurate 1680ᴾ | <<locked>> | 100% | 55,317 psi | 89% | 2815 fps | 98.3% |
| Accurate 1680ᴾ | <<locked>> | 100% | 55,317 psi | 89% | 2815 fps | 98.3% |
| Accurate 5744 | <<locked>> | 86% | 55,608 psi | 89% | 2861 fps | 99.1% |
| Accurate 5744 | <<locked>> | 86% | 55,390 psi | 89% | 2854 fps | 99.1% |
| Accurate 5744 | <<locked>> | 86% | 55,390 psi | 89% | 2854 fps | 99.1% |
| Accurate No. 11 FS | <<locked>> | 88% | 54,563 psi | 87% | 2802 fps | 100% |
| Accurate No. 11 FS | <<locked>> | 88% | 54,346 psi | 87% | 2795 fps | 100% |
| Accurate No. 11 FS | <<locked>> | 88% | 54,346 psi | 87% | 2795 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 56,057 psi | 90% | 2119 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 55,999 psi | 90% | 2116 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 55,999 psi | 90% | 2116 fps | 100% |
| ADI AR 2205 | <<locked>> | 92% | 55,738 psi | 89% | 2730 fps | 100% |
| ADI AR 2205 | <<locked>> | 92% | 55,811 psi | 89% | 2730 fps | 100% |
| ADI AR 2205 | <<locked>> | 92% | 55,811 psi | 89% | 2730 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 44,672 psi | 72% | 2769 fps | 99.7% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 44,744 psi | 72% | 2769 fps | 99.7% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 44,744 psi | 72% | 2769 fps | 99.7% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 47,819 psi | 77% | 2766 fps | 98% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 47,645 psi | 76% | 2762 fps | 97.9% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 47,645 psi | 76% | 2762 fps | 97.9% |
| Hodgdon LilGun | <<locked>> | 84% | 56,072 psi | 90% | 2838 fps | 100% |
| Hodgdon LilGun | <<locked>> | 84% | 55,869 psi | 90% | 2835 fps | 100% |
| Hodgdon LilGun | <<locked>> | 84% | 55,869 psi | 90% | 2835 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,790 psi | 46% | 1660 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,718 psi | 46% | 1657 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,718 psi | 46% | 1657 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 40,857 psi | 66% | 2641 fps | 96.7% |
| IMR 4198ᴾ | <<locked>> | 100% | 40,683 psi | 65% | 2638 fps | 96.7% |
| IMR 4198ᴾ | <<locked>> | 100% | 40,683 psi | 65% | 2638 fps | 96.7% |
| IMR 4227 | <<locked>> | 98% | 54,143 psi | 87% | 2812 fps | 99.8% |
| IMR 4227 | <<locked>> | 98% | 53,940 psi | 86% | 2805 fps | 99.7% |
| IMR 4227 | <<locked>> | 98% | 53,940 psi | 86% | 2805 fps | 99.7% |
| Lovex D060 | <<locked>> | 92% | 55,608 psi | 89% | 2861 fps | 99.1% |
| Lovex D060 | <<locked>> | 92% | 55,390 psi | 89% | 2854 fps | 99.1% |
| Lovex D060 | <<locked>> | 92% | 55,390 psi | 89% | 2854 fps | 99.1% |
| Lovex D063 | <<locked>> | 88% | 55,985 psi | 90% | 2844 fps | 99.2% |
| Lovex D063 | <<locked>> | 88% | 55,782 psi | 89% | 2838 fps | 99.2% |
| Lovex D063 | <<locked>> | 88% | 55,782 psi | 89% | 2838 fps | 99.2% |
| Lovex S040 | <<locked>> | 84% | 54,389 psi | 87% | 2697 fps | 100% |
| Lovex S040 | <<locked>> | 84% | 54,099 psi | 87% | 2694 fps | 100% |
| Lovex S040 | <<locked>> | 84% | 54,099 psi | 87% | 2694 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2805 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 54,099 psi | 87% | 2802 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 54,099 psi | 87% | 2802 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 41,466 psi | 66% | 2720 fps | 97.1% |
| Norma 200ᴾ | <<locked>> | 100% | 41,350 psi | 66% | 2713 fps | 97% |
| Norma 200ᴾ | <<locked>> | 100% | 41,350 psi | 66% | 2713 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,137 psi | 45% | 1696 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,210 psi | 45% | 1696 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,210 psi | 45% | 1696 fps | 100% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2881 fps | 99.8% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 55,709 psi | 89% | 2877 fps | 99.8% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 55,709 psi | 89% | 2877 fps | 99.8% |
| Shooters World Blackout | <<locked>> | 88% | 55,985 psi | 90% | 2844 fps | 99.2% |
| Shooters World Blackout | <<locked>> | 88% | 55,782 psi | 89% | 2838 fps | 99.2% |
| Shooters World Blackout | <<locked>> | 88% | 55,782 psi | 89% | 2838 fps | 99.2% |
| Shooters World Buffalo Rifle | <<locked>> | 92% | 55,608 psi | 89% | 2861 fps | 99.1% |
| Shooters World Buffalo Rifle | <<locked>> | 92% | 55,390 psi | 89% | 2854 fps | 99.1% |
| Shooters World Buffalo Rifle | <<locked>> | 92% | 55,390 psi | 89% | 2854 fps | 99.1% |
| Shooters World SOCOM | <<locked>> | 90% | 53,374 psi | 86% | 2785 fps | 99.3% |
| Shooters World SOCOM | <<locked>> | 90% | 53,476 psi | 86% | 2785 fps | 99.3% |
| Shooters World SOCOM | <<locked>> | 90% | 53,476 psi | 86% | 2785 fps | 99.3% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 49,400 psi | 79% | 2595 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 49,429 psi | 79% | 2595 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 49,429 psi | 79% | 2595 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 54,230 psi | 87% | 2733 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 54,201 psi | 87% | 2730 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 54,201 psi | 87% | 2730 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 44,991 psi | 72% | 2733 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 44,962 psi | 72% | 2733 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 44,962 psi | 72% | 2733 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 90% | 39,682 psi | 64% | 2566 fps | 95.3% |
| Accurate 1680 | <<locked>> | 90% | 39,726 psi | 64% | 2566 fps | 95.3% |
| Accurate 1680 | <<locked>> | 90% | 39,726 psi | 64% | 2566 fps | 95.3% |
| Accurate 5744 | <<locked>> | 80% | 46,195 psi | 74% | 2707 fps | 97.8% |
| Accurate 5744 | <<locked>> | 80% | 46,064 psi | 74% | 2700 fps | 97.8% |
| Accurate 5744 | <<locked>> | 80% | 46,064 psi | 74% | 2700 fps | 97.8% |
| Accurate No. 11 FS | <<locked>> | 80% | 42,032 psi | 67% | 2608 fps | 99.4% |
| Accurate No. 11 FS | <<locked>> | 80% | 41,916 psi | 67% | 2602 fps | 99.4% |
| Accurate No. 11 FS | <<locked>> | 80% | 41,916 psi | 67% | 2602 fps | 99.4% |
| ADI APS 450 | <<locked>> | 80% | 52,127 psi | 84% | 2064 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 52,054 psi | 83% | 2064 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 52,054 psi | 83% | 2064 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 38,972 psi | 62% | 2474 fps | 99.8% |
| ADI AR 2205 | <<locked>> | 80% | 38,943 psi | 62% | 2470 fps | 99.8% |
| ADI AR 2205 | <<locked>> | 80% | 38,943 psi | 62% | 2470 fps | 99.8% |
| ADI AR 2207 | <<locked>> | 84% | 27,441 psi | 44% | 2392 fps | 95.7% |
| ADI AR 2207 | <<locked>> | 84% | 27,456 psi | 44% | 2388 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 84% | 27,456 psi | 44% | 2388 fps | 95.6% |
| Alliant Reloder-7 | <<locked>> | 92% | 37,536 psi | 60% | 2575 fps | 95.6% |
| Alliant Reloder-7 | <<locked>> | 92% | 37,362 psi | 60% | 2572 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 92% | 37,362 psi | 60% | 2572 fps | 95.5% |
| Hodgdon LilGun | <<locked>> | 80% | 48,994 psi | 79% | 2746 fps | 100% |
| Hodgdon LilGun | <<locked>> | 80% | 48,834 psi | 78% | 2743 fps | 100% |
| Hodgdon LilGun | <<locked>> | 80% | 48,834 psi | 78% | 2743 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,914 psi | 34% | 1480 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,987 psi | 34% | 1480 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,987 psi | 34% | 1480 fps | 100% |
| IMR 4198 | <<locked>> | 96% | 36,608 psi | 59% | 2552 fps | 95.4% |
| IMR 4198 | <<locked>> | 96% | 36,448 psi | 58% | 2549 fps | 95.4% |
| IMR 4198 | <<locked>> | 96% | 36,448 psi | 58% | 2549 fps | 95.4% |
| IMR 4227 | <<locked>> | 80% | 31,575 psi | 51% | 2392 fps | 95.7% |
| IMR 4227 | <<locked>> | 80% | 31,531 psi | 51% | 2388 fps | 95.7% |
| IMR 4227 | <<locked>> | 80% | 31,531 psi | 51% | 2388 fps | 95.7% |
| Lovex D060 | 52.4 gr | 80% | 39,218 psi | 63% | 2569 fps | 96.2% |
| Lovex D060 | 52.4 gr | 80% | 39,218 psi | 63% | 2566 fps | 96.2% |
| Lovex D060 | 52.4 gr | 80% | 39,218 psi | 63% | 2566 fps | 96.2% |
| Lovex D063 | <<locked>> | 80% | 42,873 psi | 69% | 2631 fps | 97.3% |
| Lovex D063 | <<locked>> | 80% | 42,917 psi | 69% | 2631 fps | 97.3% |
| Lovex D063 | <<locked>> | 80% | 42,917 psi | 69% | 2631 fps | 97.3% |
| Lovex S040 | <<locked>> | 80% | 48,298 psi | 77% | 2615 fps | 100% |
| Lovex S040 | <<locked>> | 80% | 48,109 psi | 77% | 2608 fps | 100% |
| Lovex S040 | <<locked>> | 80% | 48,109 psi | 77% | 2608 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 30,676 psi | 49% | 2382 fps | 98.6% |
| Lovex S053 | <<locked>> | 80% | 30,530 psi | 49% | 2375 fps | 98.5% |
| Lovex S053 | <<locked>> | 80% | 30,530 psi | 49% | 2375 fps | 98.5% |
| Norma 200 | <<locked>> | 94% | 34,360 psi | 55% | 2572 fps | 95% |
| Norma 200 | <<locked>> | 94% | 34,287 psi | 55% | 2569 fps | 95% |
| Norma 200 | <<locked>> | 94% | 34,287 psi | 55% | 2569 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,537 psi | 33% | 1516 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,479 psi | 33% | 1512 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,479 psi | 33% | 1512 fps | 100% |
| ReloadSwiss RS 36 | 54.5 gr | 80% | 30,298 psi | 49% | 2405 fps | 95% |
| ReloadSwiss RS 36 | 55.9 gr | 82% | 32,155 psi | 52% | 2451 fps | 95.7% |
| ReloadSwiss RS 36 | 55.9 gr | 82% | 32,155 psi | 52% | 2451 fps | 95.7% |
| Shooters World Blackout | <<locked>> | 80% | 42,873 psi | 69% | 2631 fps | 97.3% |
| Shooters World Blackout | <<locked>> | 80% | 42,917 psi | 69% | 2631 fps | 97.3% |
| Shooters World Blackout | <<locked>> | 80% | 42,917 psi | 69% | 2631 fps | 97.3% |
| Shooters World Buffalo Rifle | 52.4 gr | 80% | 39,218 psi | 63% | 2569 fps | 96.2% |
| Shooters World Buffalo Rifle | 52.4 gr | 80% | 39,218 psi | 63% | 2566 fps | 96.2% |
| Shooters World Buffalo Rifle | 52.4 gr | 80% | 39,218 psi | 63% | 2566 fps | 96.2% |
| Shooters World SOCOM | <<locked>> | 80% | 38,435 psi | 62% | 2533 fps | 96.8% |
| Shooters World SOCOM | <<locked>> | 80% | 38,421 psi | 62% | 2530 fps | 96.8% |
| Shooters World SOCOM | <<locked>> | 80% | 38,421 psi | 62% | 2530 fps | 96.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,153 psi | 47% | 2251 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,095 psi | 47% | 2247 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,095 psi | 47% | 2247 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 36,245 psi | 58% | 2457 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 36,172 psi | 58% | 2454 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 36,172 psi | 58% | 2454 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 24,772 psi | 40% | 2277 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 24,772 psi | 40% | 2277 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 24,772 psi | 40% | 2277 fps | 95.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 72 powders for .458 Win.Mag. loaded with the .458 | 250gr | Hornady Monoflex. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,881 fps; across all powders the maximum-charge window runs from 1,657 fps to 2,881 fps. Accurate 1680 gives the best case fill at 100 %, and 72 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 45–90 %, leaving at least 10 % headroom. Accurate 1680, Accurate 1680, Accurate 1680 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Shooters World Buffalo Rifle, Lovex D060, ReloadSwiss RS 36 rank at the top here: for .458 Win.Mag. with the .458 | 250gr | Hornady Monoflex they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.